Answer:
Is not the same type of reaction
Explanation:
A combustion reaction is one that all the compounds reacts to the simple expression, for example, a moluce that have one atom of sulfure and both atom of carbono, in a aerobic combustion (with oxygen) the products are oxygen sulfure and carbon dioxide
In another hand, the descomposition reaction is a generic type, the "structure" of this type is: AB --> A+B, it would be a glucose degrade into the cicle of the citric acid
I hope you understand me
